Island



(No Model.) l 8 Sheets-Sheet 1.

' J. A. MCHARDY.

RASP MACHINE. N0- 506,0'20 Patented' June 21,1898.

(ANO Model 8 Sheets-sheen 2.

J. A.. MGHARDY. RASP MACHINE.

010.000,020. Patented June 21,1008.

me Nowms frias cn. woruuwo., WASHWGTON, uA c.

(No Model.) 8 Sheets-Sheet 3` J; A. MGHARDY. RASP MACHINE 100.606,020.Patented June 21,1898.

me Norms PETERS co. PHoro-Lrruov. wAsHmuroN. Dv c.

(No Model.) 8 SheetsSheet 4:A

J. A. MGHARDY.

RASP MACHINE Patented June 2l, 1898.

(No Modem s' sheetssheet 5.v J. A. MOHARDY.

RASP MACHINE Patented MTA/6035:

(No Model.) 8 Sheets-Sheet-.

J. A. MGHARDY.

RASP MACHINE Patented June 21,1898.

W/ TMEJJEJ.-

(No Model.) 8 Sheets-Sheet 7.

J. A. MGHARDY.

RASP MACHINE Patented June 21,1898.

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W/ -r/VEJ 656.'

@MQ/@Q (No Modell) 8 Sheets-Sheet 8.

J. A; MGHARDY.

RASP MACHINE No. 606,020. Patented June 21,1898.

b\ QMN www ArtNr Nima STATES rufen.

JAMES A. MCHARDY, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR, BY MESNEASSIGNMENTS, TO THE NICHOLSON FILE COMPANY, OF SAME PLACE.

RAS P-IVIACHIN E.

SPECIFICATION forming part of Letters Patent No. 606,020, dated June 21,1898.

Application filed May 25, 18.95. Serial No. 593,053. (No model.)

To all whom t may concern.- description, taken in connection with theac- Be it known that I, JAMES A. MCHARDY, a companying drawings, inwhichsubject of the Queen of Great Britain, resid- Figure 1 is a planview of the machine.

ing in the city and county of Providence, in Fig. 2 is a frontelevation. Fig. 3 is anvele- 55 5 the State of Rhode Island, haveinvented cervation of the left end of the machine. Fig.

tain new and useful Improvements in Rasp- 4 is an elevation of the rightend of the ma- Machines; and I do'hereby declare the folchine. Fig. 5vis a vertical section through lowing speciiication, taken in connectionwith the blank-supporting carriage, partly in elethe accompanyingdrawings, forming part of vation. Fig. 6 is a vertical section through6o ro the same, to be a full, clear, and exact dethe shaft 31. Fig. 7 isa detail View of the scription thereof. f cam for feeding thetool-carriage. Figs. S

The present invention relates to rasp-cutand 9 are details of thecutter-head and opting machines, and has for its object the proeratingand adjusting means. Fig. 9a is a deduction of a machine of the aboveclass which tail of the cutter and blank. Figs. 10, 11, 65 15 shall besimplein construction and which will and 12 are details of parts to bedescribed.

run at a higher rate of speed than has hith- The rasp-blank 1 issupported on blocks 3 erto been practicable; and to this end the in- 4,secured in a groove 5, formed in a carriage vention consists of thefeatures and combina- 2, which is mounted in suitable ways. formed tionshereinafter described and claimed. in the frame A, said blank being heldin place 7o zo The machine illustrated in the drawings, by the clamp orholder G and the presser-finwhich embodies the presentimprovements inger7. The nger 7 is secured to a presser their preferred form, comprisesgenerally a arm or lever 8, pivoted to the frame A at 9 blank-supporting carriage which is in termitand having its free end connected to aWeight tently fed forward after the completion of (not'shown) byalink10. The carriage 2 may 75 2 5 each row of rasp-teeth and a head Which isbe fed forward after the completion of each oscillated about a fixedaxis and carries a cutrow of teeth by any suitable means, andin the terrigidly secured thereon. The rear face of drawings is shown thepreferred form of such the cutter is so formed that it lies in or withinmeans. Secured to the under side of the carthe arc described by thepoint of the cutter,l riage 2 is a rack 11, which is engaged by the 8o3o and the cutter is forced into the blank in an pawl 12, pivoted to theend of an arm or learc, the rear face sliding along the bottom ver 13,pivoted to the frame at 14, and operof the recess formed by its point orjust ated through a rod l5, pivoted thereto at 1G. clearing said recess,so that there is no pres- A spring 15 is secured to a shaft 15b and sureon the rear face of the cutter. It is pre-l serves to hold the pawl 12in engagement withv 8 5 3 5 ferred to force the toolinto the stock bymeans rack 11. rllhe rod 15 is provided with a head of a cam oreccentric rather than by a blow, or iiange 17, which iits within acylinder 1SA as in the former case the cutting-tool enters and is heldagainst the end of said cylinder the blankgradually and at a slowerspeed, so by means of a spring 19, interposed between that they machinecan be run atahigher speed the head 17 and a plug 20, screwed into the9o 4o without heating the tool and blank. The end of said cylinder. Thecylinder 18 is carcutting-tool is mounted in a carriage which ried onthe end of a rod 21, which is pivoted slides on the oscillating head andis moved at 23 to the rock-arm 22, secured to the rocktransversely ofthe blank after the cutting of shaft 23. An arm 24 is also secured tothe each tooth by suitable means. 1 shaft 23 and is adj ustablyconnected to a link 95 45 The machine is also provided with means 25 bymeans of a bolt 26 and slot 27, said link for regulating' the transversemovement of being also connected to a reciprocating rod or the carriagewhile the machine is in motion, yoke 28. The yoke 28 is guided inabearing 29 thereby adapting the machine for cutting in the frame and onablock 30,which iits Withtapered rasp-blanks. in a slot in said yoke andsurrounds a shaft 31, roo 5o The detail construction of the machine willmounted in suitable bearings secured to the be understood by referenceto the following frame A. A bowl-32 on the yoke 28 runs in a cam-grooveformed in a disk 33, secured to the shaft 3l, said cam-groove beingformed with the dwells 34, the swell 35, and the depression 3G. Theshaft 3l is revolved intermittently through a ratchet-wheel 37, securedthereto, which is engaged by a pawl 38, pivoted to a pawl-carryin g arm39, loosely mounted on shaft 3l. Said arm 39 is reciprocated from aneccentric 39, mounted on the main drivin g-shaft 40, by means of the rod4l, pivoted to the end of said arm and connected to the eccentric-strap42. The driving-shaft 40 is driven continuously by a band-pulley 43,secured thereto and connected to any suitable source of power.- Anotched locking-disk 44 is secured to the shaft 3l and is engaged by aroll on a spring-arm 45 to lock said shaft in position after eachforward movement, said arm yielding and allowing the forward movement ofsaid shaft under the action ofthe pawl 38.

Any suitable means may be employed for limiting the feeding movement ofthe blankcarriage and releasing said carriage to `allow the forwardmovement of the same; but it is preferred to use the form of meansshown, which is as follows:

The carriage 2 is provided with the racks 4G 47, preferably secured onopposite sides of the carriage and the teeth of which are staggeredthatis, the teeth on one rack are substantially the distance of half a toothlength in advance of the teeth of the other rack.

`The racks 4G and 47 are engaged by teeth formed on the dogs or slides48 and 49, the teeth on said racks being in line, or, if desired, therack-teeth may be in line and the teethon the slides staggered. Ineither case, however, when one dog or slide is in engagement with theteeth of its rack the other dog or slide will rest on its rack half-waybetween the teeth. The slides 48 49 are arranged in suitable ways onopposite sides of the carriage 2 and are operated at the proper times byarms or tappets 50 51, secured to the rock-shaft 23 and engaging theends of said slides. The arms 50 and 5l extend from shaft 23, uponopposite sides thereof, so that when the shaft 23 is rocked in onedirection` one of said slides will be operated and when said shaft isrocked in the opposite direction the other of said slides will beoperated. The shaft 15b extends-outside the frame and carries at itsouter end an arm 52, which engages a pin 53, extending from the slide48, and the other end of said shaft carries an arm 54, which engages asimilar pin 55, extending from slide 49. The outer end of shaft 15b alsocarries a'handle 55, by which said shaft may be turned to lift theslides 48 49 out of engagement with the racks 46 47, the same movementof the shaft also throwing the spring 15 into such a position that thepawl 2 will drop out of engagement with the rack l1, so that thecarriage may be returned to its initial position. A lever56 is pivotedat 57 to an arm pivoted to the frame and is connected to the carriage bymeans of the rod 58 and serves as a means for returning the car riage toits initial position after the completion of a rasp.

The tool or cutter 59 is rigidly clamped in the tool-carriage 60 by anysuitable means, but preferably by the means hereinafter described, andthe tool-carriage is rigidly supported on ways 6l, formed on the head62. Said head is loosely mounted on a stud G3, secured in the frame Aand an outer bearing B, and may be oscillated to force the cutter 59into the blank to lift up the metal and form a tooth by any suitablemeans. In 0rder that the cutter 59 may enter the blank smoothly andwithout any undue strain upon the cutter and may bend or lift up thestock to form a proper tooth, the rear face of said cutter is so formedthat it lies in or within an are described about the axis of stud G3 asa centerthat is to say, in the are described by the point of the cutter.In practice the rear face of the cutter will usually be ground so thatthere is a clearance between said face and the recess formed in therasp-blank as the cutter enters the blank, and said face will lie withinthe arc described by the point of the cutter. The shape of thecutter-point will depend upon the shape of the tooth to be cut; but itis preferred to form said point substantially V-shaped and to so form`the front face that it will be substantially at right angles to thesurface of the blank when the cutter is in its forward position.

rlhe means shown, and which it is preferred to use for oscillating thehead G2 to force the cutter into the blank, consists of a cam U4,secured to the driving-shaft 40 and engaging a hardened-steel plate 70on an arm G5, secured to said head. A rubber washer 7l `may beinterposed between the plate 70 and `arm G5, if desired. A rod G6,pivoted to arm G5, has secured thereto a sleeve G7, which fits within acylinder 68, pvoted to the frame. A spring G9 surrounds said rod andbears against the sleeve 67 and a plug G9, screwed into the cylinder G8,and `holds the arm (Si against the cam 64.

In order to adjust the depth to which the cutter shall enter the blankand also to lift the cutter, if desired, so that it will not act ontheblank, thcarm is adj ustabl y secured to the head 62 and `preferablyby the means shown. As shown, the arm G5 is pivotcd at 72 in arecessformed in the head G2 `and is provided with a slot 73, in which asliding block 74 is fitted. The block 74 is mounted on an eccentric 75,formed on a stud 76, pivoted in the head G2 and having an arm 77 securedtoits outer end. rlhe arm (55 is provided with a rack 78, which isengaged by a springeatch 79 on arm 77. By shifting the arm 77 theeccentric 75 will act to lift the cutting-tool away from the blank andthus decrease the depth of the cut, and by shifting the arm far enoughthe cutter will be lifted, so that it will not act on the blank.

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After the cutting'of each tooth it is necessary that the relativeposition of the cutterv and blank should be changed in order that thecutter may enter the blank at a different point on the nextreciprocation of said cutter, and this is preferably accomplished bymoving the carriage on the head 02, although it is obvious that the sameresult could be accomplished by moving the blan k-carri age laterally.The preferred means for moving the tool-carriage is as follows:

The carriage is provided with a lug or projecting plate 80, in which isformed a curved slot 80. A sliding bar Slis connected to the carriage Gby means of a stud 82, which is turned down 'and passes loosely throughthe slot 80 and is provided with the washer 83'and nut 84 on its outerend. It is advisable that the rasp-teeth be so formed that they shallnot be in line with each other longitudinally of the blank, and the stud82 is therefore preferably adjustably secured to the bar 81, so that therelative positions of the cutter and blank may be changed at will. Inthe form shown the stud 82 slides in the bar 81 and is adjusted and heldin its adjusted position by the handle 85, pivoted in said bar andconnected to said stud by the curved arm 86, which p asses through aslot in the bar 8l and engages said stud. The bar 81 is moved backwardand forward step by step by the heartshaped cam 8G, acting through thefollowing connections: A slide or yoke 87 carriesV two bowls 88, whichengage cam 86 on opposite sides, and said slide is connected to one arm,89, of a bell-crank lever 89 by means of the link 90. The other arm, 91,of the bell-crank lever is connected with the bar 81 by a link 92. Thecam 86 is moved a step forward at each revolution of the driving-shaft40 by vmeans of a pawl 93, pivoted on the arm 39 and engaging aratchet-wheel 94, secured to the sleeve 95, on which the cam 86 is alsose'- cured, said sleeve being loosely mounted on the shaft Sl. Alocking-wheel 96 is also secured to sleeve 95 and is engaged by a rollon a spring-arm 97 to lock the cam 86, and therefore the tool-carriage,in position after each feeding movement.

In order that the cutting-tool may be accurately adjusted transverselywith relation to the blank, means are provided for adjusting the lengthof the connections between the cam '8G and the carriage 60, and to adaptthe machine for cutting different-width rasps means are provided forregulating the transverse feed of the carriage 60. In cutting taperedrasp-blanks it is necessary that the distance the carriage 60 is movedafter the cutting of each tooth -should be varied as the width of theblank varies, and it is therefore preferred to so construct the meansfor regulating the transverse feed of the carriage that said means maybe operated without stopping the machine. The preferred form of theadjusting and regulating means above referred to is illustrated in thedrawings and is as follows:

rlhe link 92 is provided with a slot at its rear end, in which slides ablock 98, which is adj usted by means of the screw-rod 99, looselypivoted in the link 92 and held in position by the collars 100 andprovided with a hand-wheel 101 at its outer end. A stud 102 projectsfrom the upper side of the block 98 and carries a washer 103, which isheld in place against the upper surface of link 92 by a nut 104. Asecond stud 109 projects yfrom the under side of block 98 and passesloosely through a block 105, mounted to slide in a slot 10G, formed inthe arm 91. A washer 107 is interposed between the under face of link 02and the upper' face of arm 91, and the parts are held in position by anut 108 and washer 110 on the end of stud 109. end and receives theflanged end 110 of a rod 111, screw-threaded in the end of arm 91 andprovided with a hand-wheel 112. A screwplug 113 surrounds the rod 111and serves to hold the Iianged end 110 inthe recess in block 105. Byturning the wheel112 the pivoted connection between the link 92 and arm91 is adjusted to or from the axis of the bellcrank lever 89, and thefeed of the carriage 60 thus regulated. By turning the wheel 101 theposition of the carriage and the tool carried thereby may be accuratelyadjusted transversely of the blank. If desired, the adjusting devicesabove described may be placed at the pivotal connections between the arm89 and link 90 instead of at the connection between the arm 91 and link92, or they may be placed at both points, as shown, and the range ofadjustment thereby increased.

The cutter may be clamped rigidly to the carriage G0 in any desiredmanner; but it is preferred to use the means shown for clamping saidcutter,which consists of the wedge-shaped slide 113i, which is operatedby a cam or eccentric 114, formed on the stud 115, pivoted in thecarriage 60. The stud 115 is rotated to move the slide 113a by a handle118, keyed thereto and held in place by a washer and nut 11G. Thecutting-tool is placed in the recess 117 in the carriage, the front wallof which is formed by the slide 113FL and is clamped firmly between therear wall ofl said recess and said slide by turning the handle 118todraw said slide toward the right in Fig. 9.

The operation of the machine is as follows: The blank 1 is placed uponthe carriage 2 in the proper position and the carriage moved into properrelation to the cutter 59, the cutter being raised out of operation bythrow* ing handle 77 to the left. The machine is now startedand thehandle 77 thrown to the right to bring the cutter into position to makethe depth of cut desired. The head 62 is re- The block 105 is recessedon one IOO IIO

ciprocated by the cam 64 at each revolution of the shaft 40, and thecutter 59, being rigidly secured to said head, is forced gradually intoand under the metal of the blank 1, thus bending or lifting the metal toform a rasptooth, the peculiar formation of the rear face of the toolallowing said action without any ing it to its normal position.

tendency to bend the cutter forward, and the pressure on the front ofthe cutter being in lines substantially parallel to the rear face. Eachrevolution of the shaft 40 also moves 4the cam S6 one step forward, andthus feeds the carriage G0 laterally one step, the parts being so timedthat the forward movement of the cam takes place when the cutter 59 isclear of the blank 1. The cam-disk 33 is also moved one step forward ateach revolution of the shaft 40, the bowl 32 riding in the dwells 34 andnot aifecting the yoke 28 while the carriage GO is being fed across theblank. .I ust after the carriage has been reversed,however, and whilethe cutter is still free from the blank thedisk 33 is moved forward tocarry lthe depression 3G past the bowl v32, thus forcing the yoke 28downward and quickly return- This movement of the yoke 2S rocks theshaft 23 and through the arm 22 compresses or energizes the spring 19,which tends to force the carriage 2 forward through the pawl 12 and rack11, said carriage being held from movement by the teeth on slide 49,which engage rack 47. .As the shaft 23 reaches the limit of its movementthe arm 5l has lifted the slide 40 clear of the rack 47 and the carriage2 is quickly fed forward under the action of spring 19, said carriagebeing stopped by the engagement of the slide 48 with rack 4G. The bowl32 now rides in the dwell 34 until the carriage GO reaches the oppositeside of the blank, when the swell 35 is fed past the bowl, thus rockingshaft in the opposite direction and energizing the spring 19, as before.This movement of the shaft 23 lifts slide 4S, thus releasing thecarriage 2, so that the spring 19 may act to feed said carriage forwarduntil the slide 40 engages the teeth of rack 47 and stops said carriage.Thus the cutter is fed backward and forward across the blank and theblank fed forward after the completion of each row of teeth. In orderthat the teeth may not be in line with each other longitudinally of theblank, the operator rocks the handle 85 to the right or left after thecutting of every two or three rows of teeth, thus varying therelation ofthe blank and cutter in the formation of different rows of teeth.

In cutting tapered blanks the operator gradually decreases thetransverse feed of the carriage G0 as the width of the blank decreasesby turning the wheel 112, and thus moving the block 105 nearer the axisof the bell-crank lever S9@ lVhat I claim as my invention, and desire toobtain by Letters Patent, is-

1. In a rasp-machine the combination with a support for the blank, of anoscillating head mounted to oscillate about a fixed axis, a cutterrigidly mounted on said head and having its rear face in or within thearc described by its point, and means for oscillating said head to forcesaid cutter into said blank to lift the metal and form a tooth,substantially as described.

2. In a rasp-machine, the combination with a support for the blank, ofan oscillating head mounted to oscillate about a ixedv axis, a cutterrigidly mounted on said head and having itsrear face in or within thearc described by its point, means for oscillating said head to forcesaid cutter into said blank to lift the metal and form a tooth, andmeans for regulating the depth to which the cutter shall enter theblank, substantially as described.

3. In a rasp-machine, the combination with a support for the blank, ofan oscillating head mounted to oscillate about a fixed axis, a cutterrigidly mounted on said head and having its rear face in or within thearc described by its point, means for forcing said cutter into theblank, and a spring for returning said cutter, substantially asdescribed.

4. In a rasp-machine the combination.

. t: le* a support for the blank, of an oscillatinglead mounted tooscillate about a fixed axis, a cutter rigidly mounted on said head andhaving its rear face in or within the arc described by its point, meansforoscillating said head to force said cutter into said blank to lift upthe metal and form a tooth, and means forintermittenti y changing therelative positions of the cutter and blank, substantially as dcscribed.

5. In a rasp-machine the combination with a support for the blank, of anoscillating head mounted to oscillate about a xed axis, a cnt-.

ter rigidly mounted on said head and having its rear face in or withinthe arc described by its point, an arm secured to said head, a cam forrocking said arm, whereby said cutter is forced into said blank and themetal lifted to form a tooth, substantially as described.

6. In a rasp-machine the combination with a support for the blank, of anoscillating head mounted to oscillate about a fixed axis, atool-carriage mounted on said head, a cutter rigidly secured in saidcarriage and having its rear face in or within the arc described by itspoint, means for oscillating said head to force said cutter into theblank to lift the metal and form a tooth, and means for intermittentlymoving said carriage on said head, substantially as described.

7. In a rasp-machine, the combination of an oscillating head, means forsecuring a cut-ter to said head, an arm adjustably secured to said head,means for adjusting said arm without'stopping the machine, substantiallyas described.

8. In a rasp-machine the combination of an oscillating head, means forsecuring a cutter to said head, an arm pivoted to said head, and anadjustable connection between said arm and head, substantially asdescribed.

9. In a rasp-machine the combination of an oscillating head, an armpivoted to said head, a stud pivoted in said head, a cam on said studengaging said arm, and means for adjusting said stud, substantially asdescribed.

10. In a rasp-machine the combination of a reciprocating head atool-carriage mounted IOO IIO

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on said head, means for feeding said carriage on said head, and meansfor regulating the action of said feeding means without stopping themachine, substantially as described.

ll. In a rasp-machine the combination of a reciprocating head, atool-carriage on said head, a sliding bar, an adjustable connectionbetween said bar and head, and means for intermittently moving said bar,substantially as described.

l2. In a rasp-machine the combination of a reciprocating head, atool-carriage on said head, a slot in said carriage, a sliding bar,

stud projecting through said slot and adjustably connected to said bar,substantially as described.

13. In a rasp-machine the combination of a reciprocating head, atool-carriage on said head, a sliding bar, a stud connected to saidcarriage and mounted in said bar and a handle for regulating theposition of said stud, substantially as described.

14. In a rasp-machine the combination. of a reciprocating head, atool-carriagel mounted thereon,- a cam for moving said carriage on saidhead, connections between said cam and carriage, means for regulatingthe action of said cam, and means for adjusting the length of saidconnections, substantially as described.

15. In a rasp-machine the combination with a reciprocating head, atool-carriage mounted on said head, a lever, connections between saidlever and said carriage, means for adjusting said connections radiallyand transversely of said lever, and means for oscillating said lever,substantially as described.

I6. The combination of an arm, a block adjustably mounted on said arm,and provided with a stud, a second block pivoted on said stud, and amovable part on which said second block is adj ustably mounted,substantially as described.

17. The combination with a carriage, of means for feeding said carriagecomprising a spring, means independent of the carriage for energizingsaid spring, and means for restraining and releasing said spring,substantially as described. p

1S. The combination with a carriage, of means for feeding said carriagecomprising a spring, means independent of the carriage for energizingsaid spring, a dog for restraining said spring, and means for releasingthe dog, substantially as described.

19. The combination with a carriage, of means for feeding said carriageforward comprising a spring, means independent of the carriage forenergizing said spring, and means for holding said carriage against theaction of said spring and releasing said carriage, substantially asdescribed.

20. The combination with a carriage, of a rack secured to said carriage,a pawl engaging said rack, means for reciprocating said pawl comprisinga spring, means for energizd ing said spring, and means for holding andreleasing said carriage, substantially`as described.

21. The combination with a carriage, of a rack secured thereto, a pawlengaging said rack, a rock-shaft, a spring connection between said shaftand pawl, means for holding said carriage against the action of saidpawl and spring, and means for releasing said carriageby the. rocking ofsaid shaft, substantially as described.

22. The combination with a carriage, of a spring for feeding saidcarriage forward, means independent of the carriage for energizing saidspring, a dog for holding said carriage against the action of thespring, and means for releasing said dog, substantially as described. Y

23. The combination with a carriage, racks secured to said carriage,dogs arranged to engage said racks and tappets directly engaging saiddogs for alternately moving the dogs out of engagement with the racks,and means for feeding the carriage forward, substantially as described.

24. The combination with a carriage, of means for feeding said carriageforward, means for stopping and releasing said carriage, and mechanismfor throwing said feeding and stopping and releasing means out ofoperation, substantially as described.

25. In a rasp-machine the combination with a support for the blank, of ahead mounted to oscillate about a fixed axis, a cutter rigidly mountedon said head and having its point adjacent a vertical line passingthrough the axis of the head, and means for oscillating said headwhereby the cutter is carried both downward and with an inward sweep.

JAMES A. MOI-IARDY.

Witnesses: v f

IRA L. FISH, W. II. THUns'roN.

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